juce_VBlankAttachment.h

Go to the documentation of this file.

 /*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
class JUCE_API  VBlankAttachment final  : public ComponentPeer::VBlankListener,
                                          public ComponentListener
{
public:
    VBlankAttachment() = default;
 
    VBlankAttachment (Component* c, std::function<void()> callbackIn);
    VBlankAttachment (VBlankAttachment&& other);
    VBlankAttachment& operator= (VBlankAttachment&& other);
 
    ~VBlankAttachment() override;
 
    bool isEmpty() const { return owner == nullptr; }
 
    //==============================================================================
    void onVBlank() override;
 
    //==============================================================================
    void componentParentHierarchyChanged (Component&) override;
 
private:
    void updateOwner();
    void updatePeer();
    void cleanup();
 
    Component* owner = nullptr;
    Component* lastOwner = nullptr;
    std::function<void()> callback;
    ComponentPeer* lastPeer = nullptr;
 
    JUCE_DECLARE_NON_COPYABLE (VBlankAttachment)
};
 
} // namespace juce